Abstract
<title>Abstract</title> <p> A visible light-responsive Pt,Ru Noble metals were introduced by wet impregnation after the In <sub>2</sub> S <sub>3</sub> /Pt,Ru-doped Ta <sub>2</sub> O <sub>5</sub> heterostructured catalyst film was produced using a combination hydrothermal and doctor blading method. XRD, UV-Vis diffuse reflectance spectroscopy, SEM, TEM-EDS, and XPS were used to evaluate the physicochemical properties after the composition was enhanced by varying the In <sub>2</sub> S <sub>3</sub> content (25–75 wt.%). In addition to exhibiting a narrow bandgap (~ 2.14 eV) and increased visible light absorption, the optimized In <sub>2</sub> S <sub>3</sub> /Pt,Ru–Ta <sub>2</sub> O <sub>5</sub> composite with 75 wt.% In <sub>2</sub> S <sub>3</sub> additionally had a larger surface area and uniformly distributed plate-like In <sub>2</sub> S <sub>3</sub> on the Ta <sub>2</sub> O <sub>5</sub> . XPS investigations indicated strong electronic interactions between the Pt/Ru species and Ta <sub>2</sub> O <sub>5</sub> , as evidenced by binding energy shifts and the formation of partially oxidized metal species and oxygen vacancies, which serve as effective charge-trapping sites. Rhodamine B degradation under visible light irradiation was carried out to measure photocatalytic performant, and after 120 min., up to 92.0% removal was achieved. Superoxide radicals ( <sup>•</sup> O <sub>2</sub> <sup>–</sup> ) were exhibited to be the predominant reactive species in scavenger analysis, suggesting effective interfacial electron transportation.The interaction of defect-mediated electronic interactions, metal-induced charge separation, and heterojunction formation are responsible for the enhanced performance. These results indicate that a successful approach for altering the electronic structure and improving the charge carrier dynamics in heterostructured oxide-based photocatalysts is the logical integration of In <sub>2</sub> S <sub>3</sub> with Pt,Ru-modified Ta <sub>2</sub> O <sub>5</sub> . </p>